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Goodwill and Intangibles - Finite-Lived Intangible Assets, Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Amortization Expense    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 $ 39,742  
2020 33,521  
2021 18,824  
2022 17,801  
2023 17,510  
Thereafter 52,121  
Finite-lived intangible assets, net carrying value $ 179,519  
Placement Fee Accretion    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019   $ 3,380
2020   371
2021   371
2022   310
2023   289
Thereafter   531
Finite-lived intangible assets, net carrying value   $ 5,253